Looks like that was a flaw in the ply to start with. It's not terribly difficult to patch something like that with a piece of birch or maple veneer, cut to shape to cover the damage. In your case a piece with straight parallel sides, curved where it meets the paint. Hold it in place, scribe with an exacto knife, carefully chisel out to an even depth slightly less than the thickness of the patch. Glue and clamp the patch, then level by scraping and sanding. Shellac will match the color. It will look better than that original crack. PM me I can send you veneer if you don't have a source.